Several tony restaurants in the Hamptons say a Manhattan woman cooked up a scam to take them to the cleaners by claiming a clumsy waiter spilled food on her clothes.

David Loewenberg, owner of the Red Bar Brasserie in Southampton and The Beacon in Sag Harbor, discovered the scheme when he received the exact same letter and an $8.50 cleaning bill at both restaurants – one of which was closed at the time.

Loewenberg told The Post the message he has for the alleged scammer is “We’re onto you.”

At least 10 restaurateurs received an identical letter that began “My name is Roz Williams” and states that “one of your wait staff person [sic] accidentally spilled food on my clothes.”

Providing a copy of a paid receipt for $8.50 from the Custom Care Cleaners at 47 Columbia St., the letter asks for “someone to take care of this bill,” noting “I really love your food … I would hate to stop eating there.”

Loewenberg got the letter at the Red Bar Brasserie last week, and “cut a check and put it in the mail the next day,” he said.

That same day, as he opened mail at The Beacon – which had been shuttered since September – he found another letter with the same name and return address, 120 Columbia St.

“It was the same letter and a Xerox of the same bill. Obviously, it was a scam,” Loewenberg said. “When I looked at the second letter, I realized it was a form letter. I felt silly.”

He told WordHampton, a restaurant public-relations firm which e-mailed a “scam alert” to its Long Island clients.

“I have 10 [letters] so far,” said Southampton Village police Detective Fred Nordt. That, he said, qualifies as a felony.

“We’re working on it and contacting other law-enforcement agencies,” Nordt said.

Ted Conklin, owner of The American Hotel in Sag Harbor, sent a check for $8.50 before WordHampton’s e-mail alarm went out. “I want to invite her out for the weekend, then pounce on her with the police,” he said.

Robert Durkin, owner of Robert’s Restaurant in Water Mill, paid the $8.50, then shelled out $10 to cancel the check.

“I hear the food upstate in prison is real good,” was Durkin’s message to the scammer. “Bon appetit.”

An employee at Custom Care Cleaners called the person who identified herself as Williams a “good customer” and said the $8.50 receipt was for a stained two-piece black suit brought there Dec. 2.

Michael Castino, chef-owner of Pacific East in Amagansett, who got the scam alert and didn’t pay, said, “It’s kind of scary because in this economy you can prey on a businessman’s fears … The last thing we need to do is lose even one client.

“It’s like the perfect scam. It’s $8.50. Who’s not going to pay that?”

Visits to the Lower East Side address given for Roz Williams turned up empty.